John and I OR I and John

[yabi]

Is there any grammar rule for the order in "I and John" OR "John and I"?

A friend of mine mentioned that:
If it is a positive situation, then "I" should come second
and If it is a negative situation, then "I" should come first.

I am not sure about the order in my samples, but want to know if there is a grammatical rule? Because as far as I remember, "I" always should come last regardless of the situation.

[5jj]

John and I went to the same university.
John and I didn't take the same subjects.
Both John and I played rugby.
Neither John nor I had a girlfriend.
My father took John and me to the cinema.
He didn't take John and me to the theatre.

'I' comes last. It's style, not grammar.

[konungursvia]

Yes, style as a corollary of good manners.